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Design and Calibration of a Small-Footprint, Low-Frequency, and Low-Power Gate Leakage Timer Using Differential Leakage Technique

Yuya NISHIO, Atsuki KOBAYASHI, Kiichi NIITSU

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Summary :

This study proposes a design and calibration method for a small-footprint, low-frequency, and low-power gate leakage timer using a differential leakage technique for IoT applications. The proposed gate leakage timer is different from conventional ones because it is composed of two leakage sources and exploits differential leakage current for the charging capacitor. This solution alleviates the inherent trade-off between small-footprint and low-frequency in the conventional gate leakage timer. Furthermore, a calibration method to suppress variations of the output frequency is proposed in this paper. To verify the effectiveness of the proposed gate leakage timer, a test chip was fabricated using 55-nm-DDC-CMOS technology. The test chip successfully demonstrates the highest figure of merit (FoM) of the product of the capacitor area (0.072µm2) and output frequency (0.11Hz), which corresponds to an improvement by a factor of 2,121 compared to the conventional one. It also demonstrates the operation with 4.5pW power consumption. The total footprint can be reduced to be 28µm2, which enables low-cost and low-power IoT edges. The scaling scenario shows that the proposed technique is conducive to technology scaling.

Publication
IEICE TRANSACTIONS on Electronics Vol.E102-C No.4 pp.269-275
Publication Date
2019/04/01
Publicized
Online ISSN
1745-1353
DOI
10.1587/transele.2018CDP0005
Type of Manuscript
Special Section PAPER (Special Section on Solid-State Circuit Design — Architecture, Circuit, Device and Design Methodology)
Category

Authors

Yuya NISHIO
  Nagoya University
Atsuki KOBAYASHI
  Nagoya University
Kiichi NIITSU
  Nagoya University

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